Hello and welcome to our LIVE coverage of Barcelona and Bayer Leverkusen's Champions League last-16 second leg at Camp Nou, with Barca leading 3-1 from the first leg.

MESSI WITH A HAT-TRICK! And it's the same goal that he started with, scooping a silly finish from 15 yards as Leno approached. Nice pass Cesc, diagonal run again and Schwaab lumbering. Right foot too.

The corner lands at the feet of Alves outside the box but he slips as he shoots and it's blocked. Messi on the left crosses for Pique, who is still hanging around, but Leno claims first.

Iniesta on the left, he cuts inside, now Messi, now Fabregas, this is absurd and he must score but he tries a final pass to give Iniesta the tap-in but blocked and hacked behind!

The second half is underway.

Half-time and you may as well go for a run or something. Barca are in second gear and leading 2-0 on the night thanks to a sublime brace from ringer-in-chief Lionel Messi.

Pique pops up on the right wing, winning a throw off Kadlec with his cross. Now Iniesta cuts in from the right, a one-two with Messi and Alves could be in but cleared by Kadlec. Still with Barca though, who are now running rings around Leverkusen.

Castro is finally booked for leaving the nightmarishly good Iniesta on the feet after a Catalan shuffle from the midfield maestro.

Leno makes a super double save after Fabregas and Pedro try to finish! Messi's delighftul through-ball initiated that.

STAT: Lionel Messi has scored 50 goals for club and country so far this season.

MESSI! GOAL! Classic Leo, dribbling inside from the right to shift it on to his left foot, with which he unleashes a savage low drive into the bottom left. Started by a surging run from Iniesta. 2-0, 5-1.

Messi and Cesc almost combine but the final pass finds keeper Leno. Down the other end a decent cross from Bender changes direction at the last to land behind Kiessling.

When you have a high line you need a keeper who can play a bit - and Valdes is just that, striding towards halfway to control the ball and slide the pass out.

Barca need to settle back into their groove but Messi loses control of the ball.

A Castro throw finds Mascherano in a pickle but Kiessling's cross sails out for a goal kick.

Derdiyok almost gets in behind the high Barca line again but the through ball just too heavy.

Easy claim for Valdes after Rolfes's cross sails over Derdiyok's head.

Good play by Leverkusen as they pass their way to the edge of the box, where Renato has a shot that is blocked. Barca counter but Xavi blasts miles over.

Pedro races through from Xavi's ball but he is offside this time. Tigh.

Derdiyok flicks it on, Pique heads clear but a flying Kiessling volleys, the shot blocked by Pique who readjusted well.

Now Messi pops up again on the right, cutting inside past one challenge but his low left-foot shot blocked by a flying Toprak. That was goal-bound.

Pique misses a header to let Kiessling in, but the Germany forward has too much to do and his cross doesn't get past Mascherano.